US4528737A - Adapter for power tool installation of tangless helically coiled insert - Google Patents

Adapter for power tool installation of tangless helically coiled insert Download PDF

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Publication number
US4528737A
US4528737A US06/581,840 US58184084A US4528737A US 4528737 A US4528737 A US 4528737A US 58184084 A US58184084 A US 58184084A US 4528737 A US4528737 A US 4528737A
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US
United States
Prior art keywords
insert
mandrel
tapped hole
tool
tangless
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/581,840
Inventor
Frank J. Cosenza
Albert K. Yamamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RENORD Inc A CORP OF WI
Kato Spring Works Co Ltd
Fairchild Industries Inc
Rexnord Inc
Citicorp North America Inc
Original Assignee
Rexnord Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rexnord Inc filed Critical Rexnord Inc
Assigned to RENORD INC., A CORP OF WI reassignment RENORD INC., A CORP OF WI ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: COSENZA, FRANK J., YAMAMOTO, ALBERT K.
Priority to US06/581,840 priority Critical patent/US4528737A/en
Priority to BR8500728A priority patent/BR8500728A/en
Priority to DE8585630009T priority patent/DE3575271D1/en
Priority to EP85630009A priority patent/EP0153266B1/en
Priority to IL74381A priority patent/IL74381A/en
Priority to ES1985284752U priority patent/ES284752Y/en
Priority to MX204387A priority patent/MX158441A/en
Priority to AU38992/85A priority patent/AU566296B2/en
Priority to KR1019850001057A priority patent/KR880001935B1/en
Priority to JP60031667A priority patent/JPS60191777A/en
Priority to CA000474840A priority patent/CA1232714A/en
Priority to ZA851321A priority patent/ZA851321B/en
Publication of US4528737A publication Critical patent/US4528737A/en
Application granted granted Critical
Assigned to WADE, WILLIAM J., RODNEY SQUARE NORTH, WILMINGTON DELAWARE 19890, TRUSTEE, WILMINGTON TRUST COMPANY, RODNEY SQUARE NORTH, WILMINGTON DELAWARE 19890, A CORP. OF DE. reassignment WADE, WILLIAM J., RODNEY SQUARE NORTH, WILMINGTON DELAWARE 19890, TRUSTEE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: REXNORD INC.
Assigned to REXNORD HOLDINGS INC., 350 N. SUNNY SLOPE, BROOKFIELD, WI 53005, A DE CORP. reassignment REXNORD HOLDINGS INC., 350 N. SUNNY SLOPE, BROOKFIELD, WI 53005, A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: REXNORD INC., A CORP. OF WI
Assigned to WILMINGTON TRUST COMPANY AND WADE WILLIAM J. AS TRUSTEES reassignment WILMINGTON TRUST COMPANY AND WADE WILLIAM J. AS TRUSTEES ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: REXNORD HOLDINGS INC., A CORP. OF DE
Assigned to FAIRCHILD INDUSTRIES, INC. reassignment FAIRCHILD INDUSTRIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: REXNORD HOLDINGS INC., A CORP. OF DE
Assigned to VSI CORPORATION, A CORP. OF DE reassignment VSI CORPORATION, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FAIRCHILD INDUSTRIES, INC.
Assigned to WILMINGTON TRUST COMPANY, A DE BANKING CORP. reassignment WILMINGTON TRUST COMPANY, A DE BANKING CORP. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VSI CORPORATION, A DE CORP.
Assigned to KATO SPRING WORKS COMPANY, LTD. reassignment KATO SPRING WORKS COMPANY, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VSI CORPORATION
Assigned to CITICORP NORTH AMERICA, INC. reassignment CITICORP NORTH AMERICA, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WADE, WILLIAM J., WILMINGTON TRUST COMPANY
Assigned to CITICORP NORTH AMERICA, INC. reassignment CITICORP NORTH AMERICA, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WADE, WILLIAM J., WILMINGTON TRUST COMPANY
Assigned to CITICORP USA, INC. reassignment CITICORP USA, INC. SECURITY AGREEMENT Assignors: FAIRCHILD HOLDING CORP.
Assigned to CITICORP USA, INC. reassignment CITICORP USA, INC. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FAIRCHILD HOLDING CORP.
Assigned to REXNORD HOLDINGS INC. reassignment REXNORD HOLDINGS INC. RELEASE AND REASSIGNMENT OF PATENTS AND PATENT APPLICATIONS AS SECURITY Assignors: CITICORP NORTH AMERICA, INC.
Assigned to FAIRCHILD HOLDING CORP. reassignment FAIRCHILD HOLDING CORP. RELEASE AND REASSIGNMENT OF PATENTS AND PATENT APPLICATIONS AS SECURITY Assignors: CITICORP USA, INC.
Assigned to FAIRCHILD HOLDING CORP. reassignment FAIRCHILD HOLDING CORP. RELEASE AND REASSIGNMENT OF PATENS AND PATENT APPLICATIONS AS SECURITY Assignors: CITICORP USA, INC.
Assigned to REXNORD INC. reassignment REXNORD INC. RELEASE AND REASSIGNMENT OF PATENT AND LICENSE AGREEMENT Assignors: WADE, WILLIAM J., WILMINGTON TRUST COMPANY
Assigned to VSI CORPORATION reassignment VSI CORPORATION RELEASE AND REASSIGNMENT OF PATENTS AND PATENT APPLICATIONS AS SECURITY Assignors: CITICORP NORTH AMERICA, INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/143—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same for installing wire thread inserts or tubular threaded inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/30—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same positioning or withdrawing springs, e.g. coil or leaf springs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53687—Means to assemble or disassemble by rotation of work part
    • Y10T29/53691—Means to insert or remove helix

Definitions

  • This invention relates to a tool for installing wire coil screw thread inserts and, more particularly, to an improved power-driven installation tool for tangless wire coil inserts.
  • the prior art insertion tools generally comprise complicated devices in which the prewinder, used for contracting the original oversized insert to a smaller diameter, does not permit the insert to properly engage the first threads of the patent material. These prior art devices further do not provide for reversing the torque and removing the mandrel from the insert after it has been installed to its proper predetermined depth.
  • the present invention is directed to a power-driven tool for inserting tangless helically coiled inserts in tapped holes and comprises a sleeve member having a rotatable and axially movable mandrel, threaded at one end to receive the insert, insertable therein, a pivotal catch located in a cutout near the threaded end portion of the mandrel for installing the insert in the tapped hole, a helix maintaining retracting sleeve axially movable and circumscribed above the mandrel, and a bearing member fixed to the front of the sleeve member and adapted to contact the parent material and automatically reverse the direction of travel of the mandrel.
  • a further object of the present invention is to provide a reliable power-driven installation tool with a minimum of moving parts both for ease of manufacture and ease of use.
  • a still further object of the present invention is to provide a power-driven installation tool provided with a free spinning bearing on the front of the tool which prevents the tool from jamming against the parent material.
  • FIG. 1 is a side elevation view, partially broken away, of a tangless helically coiled insert power-driven installation tool, prior to installation of the insert, in accordance with the present invention
  • FIG. 2 is a side elevation view, partially broken away, of a tangless helically coiled insert power-driven installation tool, after the insert has been installed in a tapped hole, in accordance with the present invention
  • FIG. 3 is a perspective view of the leading end of the pawl of the present invention.
  • FIG. 4 is a sectional view, with some details omitted, taken along lines 4--4 of FIG. 2.
  • the present invention is particularly adapted for use with tangless coils which are used, for example, where a steel alloyed bolt having conventional threads is desired to be fastened into a material of relatively softer alloy, such as aluminum.
  • the power-driven installation tool 10 of the present invention is attached to a prime mover 42, which is not part of the invention and, therefore, is illustrated in dash lines.
  • the prime mover may be an electric driver, e.g., manufactured by Hios as Model SB 650C.
  • the tool 10 of the present invention comprises a tubular body member 12, a mandrel assembly 14 insertable into the tubular body and adapted to receive a tangless insert, a sleeve member reciprocating in the direction of the longitudinal axis of the mandrel assembly 14, a bearing member 50 at the front of the tubular body and an adjusting means 16 movable along the mandrel assembly 14 wherein the depth to which the insert 11 can be driven is adjustable within certain limits.
  • the tubular body member 12 provides, in part, the operator with a means for supporting the mandrel assembly 14 in order to install the insert correctly during operation.
  • the tubular body member 12 may include wrenching flats 41 for securing the tool 10 while moving the adjusting means 16.
  • the mandrel assembly 14 is insertable into the tubular body member 12 and is adapted to receive the tangless insert for installation into a tapped hole.
  • the mandrel assembly 14 comprises a cylindrical rod 20 having a shank end adapted to be received in the chuck of the prime mover 42.
  • the lead end 22 of the rod 20, at the end opposite the shank end 24, is threaded and has a diameter according to the inner diameter that insert 11 will have when it is in its contracted state and installed in a tapped hole 15 of the parent material 17.
  • the diameter of lead end 22 is somewhat smaller than the inner coil diameter of insert 11 prior to the application of the tool.
  • the sleeve member 18 biased by spring 42 between lip 43 and trailing bias adjustment 44, is closely fitted concentrically about the lead end 22 of the rod 20 to maintain the helix angle of the insert 11 for a smooth transition of the insert into the tapped hole 15. If the sleeve member 18 fits too loosely around the insert or is omitted, then the helix of the insert will flatten out and the insert will not properly engage the first threads of the parent material.
  • an adjusting means 16 serves as a jamb nut with the end portion 13 of movable tubular body member 12, thereby adjusting the distance that the lead end 22 of the rod 20 may project out of the tubular body member 12, thus defining the proper depth to which the insert 11 may be installed in a tapped hole.
  • the bearing member 50 generally made of nylon and fitting around the ring 48 on the front portion of the tubular body member 12, bears against the parent material 17 when the insert 11 is installed to the predetermined depth, and increases the friction on the tool wherein the driving torque is automatically reversed and the mandrel is screwed out of the tapped hole.
  • FIGS. 1 and 2 the pivotable catch or pawl 30 of the invention is illustrated within a longitudinal cutout 32 of mandrel assembly 14.
  • the cutout 32 generally does not extend through the front end 21 of the rod 20, but is generally equal in length to the pawl 30.
  • the pawl 30 is biased within the cutout 32 so that a hook portion 34 protrudes through aperture 33 and engages the recess 52 of the tangless wire coil insert 11.
  • the pawl is generally biased about pivot point 36 by springs 38 to locate the hook portion 34 into the recess 52 of the insert when the insert is screwed onto the lead end 22 of the mandrel assembly 14.
  • the pivotal pawl 30 further includes lead ramps 40, shown in FIG. 3.
  • the ramp 40 in combination with the truncated end portion 46 of the insert provides a camming means for pivoting the pawl 30 inwardly.
  • the important feature of the pivotable pawl 30 is that it has the ability to locate the hook portion 34, which generally extends between two peaks of the threaded portion of the lead end 22 of the rod, only in the recess of the insert 11 to threadably drive the insert 11 into a tapped hole.
  • counter rotation of the cylindrical rod 20 when the insert has reached its predetermined depth, allows the pivotal pawl 30 to automatically disengage from the recess of the insert to permit extraction of the tool.
  • the ramp 40 provided adjacent but on the opposite side of the centerline of the pivotal pawl 30 permits the recess 52 of the insert 11 to automatically push the pawl 30 downward upon counter clockwise rotation of the cylindrical rod 20, and thus providing an automatic extraction of the tool 10.
  • the pivotable pawl 30 also has a notch 60 rearwardly adjacent the hook portion 34.
  • This notch 60 captures the inner thread of the next adjacent thread to the lead thread of the insert to prevent the recess 52 of the insert from slipping off the hook portion 34 when rearward axial force is applied to the insert.
  • this anti-slipback notch 60 assures engagement of hook portion 34 and the insert.
  • the hook portion 34 of the pawl 30 engages the recess 52 of the lead end 54 in order that the insert 11 may be screwed by means of the tool 10 into a tapped hole. Since both free ends of the helical coiled insert have recesses 52 cut therein, the insert may be inserted in the tool in either direction, thus eliminating the possibility of the operator inserting insert on the tool in the wrong direction.
  • the insert 11 is screwed onto the lead end 22 of the mandrel assembly 14 until the hook 34 contacts the recess 52 of the lead coil. Then the insert is driven into the tapped hole until the bearing contacts the surface of the tapped hole, whereupon the tool automatically reverses out of the insert and the tapped hole. If after an insert has been installed and the tool removed, it becomes necessary to adjust the depth of the insert in the tapped hole, the tool of the present invention may be reinstalled. To reinstall the tool, the ramp portion 40 of the pivotal pawl 30 cooperates with a truncated portion 46 of the free end of the insert 11 to push the pawl 30 in a downward direction.
  • the pivotal pawl 30 moves along the inner surface of the coil past the truncated portion of the coil, past the recess 52 of the trailing portion of the coil axially along the insert until the hook portion 34 of the pawl again engages the recess at the lead end of the coil.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)

Abstract

A power-driven insertion tool for a helically coiled wire insert of the type used for tapped holes in parent material that is generally softer than a fastener being screwed into the tapped hole, whereby a mandrel having a threaded lead portion and a pivotal pawl inserted in a groove below the threaded portion so that the pawl engages a recess of the insert, in order that the insert may be screwed into the tapped hole. A sleeve, concentric to the threaded mandrel, maintains the insert's helix angle for a smooth transition into the tapped hole. An adjusting nut adjusts the depth to which an insert may be installed and whereby a free spinning bearing contacts the parent material and automatically reverses the torque of the tool.

Description

BACKGROUND OF THE INVENTION
This invention relates to a tool for installing wire coil screw thread inserts and, more particularly, to an improved power-driven installation tool for tangless wire coil inserts.
Tools for the installation of wire coil inserts having at one end a diametrical tang of its end convolution so arranged so that the tang can be gripped by the tool as it projects from the coil for installation into a tapped hole are described, e.g., in U.S. Pat. No. 3,111,751. However, the tools are not compatible with tangless wire coil inserts.
The prior art insertion tools, however, generally comprise complicated devices in which the prewinder, used for contracting the original oversized insert to a smaller diameter, does not permit the insert to properly engage the first threads of the patent material. These prior art devices further do not provide for reversing the torque and removing the mandrel from the insert after it has been installed to its proper predetermined depth.
SUMMARY OF THE INVENTION
The present invention is directed to a power-driven tool for inserting tangless helically coiled inserts in tapped holes and comprises a sleeve member having a rotatable and axially movable mandrel, threaded at one end to receive the insert, insertable therein, a pivotal catch located in a cutout near the threaded end portion of the mandrel for installing the insert in the tapped hole, a helix maintaining retracting sleeve axially movable and circumscribed above the mandrel, and a bearing member fixed to the front of the sleeve member and adapted to contact the parent material and automatically reverse the direction of travel of the mandrel.
Accordingly, it is an object of the present invention to provide a power-driven insertion tool which will drive an insert a predetermined depth into a tapped hole and then automatically reverse the torque to drive the tool out of the tapped hole.
It is another object of the present invention to provide a power-driven insertion tool with a threaded mandrel and pivotal pawl which snaps into the notch located on the lead coil of a tangless wire coil insert, thus minimizing the time required to insert said coiled insert in a tapped hole.
A further object of the present invention is to provide a reliable power-driven installation tool with a minimum of moving parts both for ease of manufacture and ease of use.
A still further object of the present invention is to provide a power-driven installation tool provided with a free spinning bearing on the front of the tool which prevents the tool from jamming against the parent material.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of the invention, its operating advantages and specific objects obtained by its use, reference should be had to the accompanying drawings and descriptive matter in which there is illustrated and described a preferred embodiment of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawings, forming a part of this specification, and in which reference numerals shown in the drawings designate like or corresponding parts throughout the same,
FIG. 1 is a side elevation view, partially broken away, of a tangless helically coiled insert power-driven installation tool, prior to installation of the insert, in accordance with the present invention;
FIG. 2 is a side elevation view, partially broken away, of a tangless helically coiled insert power-driven installation tool, after the insert has been installed in a tapped hole, in accordance with the present invention;
FIG. 3 is a perspective view of the leading end of the pawl of the present invention;
FIG. 4 is a sectional view, with some details omitted, taken along lines 4--4 of FIG. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The present invention is particularly adapted for use with tangless coils which are used, for example, where a steel alloyed bolt having conventional threads is desired to be fastened into a material of relatively softer alloy, such as aluminum.
As illustrated in FIGS. 1 and 2, the power-driven installation tool 10 of the present invention is attached to a prime mover 42, which is not part of the invention and, therefore, is illustrated in dash lines. The prime mover may be an electric driver, e.g., manufactured by Hios as Model SB 650C. The tool 10 of the present invention comprises a tubular body member 12, a mandrel assembly 14 insertable into the tubular body and adapted to receive a tangless insert, a sleeve member reciprocating in the direction of the longitudinal axis of the mandrel assembly 14, a bearing member 50 at the front of the tubular body and an adjusting means 16 movable along the mandrel assembly 14 wherein the depth to which the insert 11 can be driven is adjustable within certain limits. The tubular body member 12 provides, in part, the operator with a means for supporting the mandrel assembly 14 in order to install the insert correctly during operation. The tubular body member 12 may include wrenching flats 41 for securing the tool 10 while moving the adjusting means 16.
The mandrel assembly 14 is insertable into the tubular body member 12 and is adapted to receive the tangless insert for installation into a tapped hole. The mandrel assembly 14 comprises a cylindrical rod 20 having a shank end adapted to be received in the chuck of the prime mover 42. The lead end 22 of the rod 20, at the end opposite the shank end 24, is threaded and has a diameter according to the inner diameter that insert 11 will have when it is in its contracted state and installed in a tapped hole 15 of the parent material 17. Thus, the diameter of lead end 22 is somewhat smaller than the inner coil diameter of insert 11 prior to the application of the tool.
The sleeve member 18, biased by spring 42 between lip 43 and trailing bias adjustment 44, is closely fitted concentrically about the lead end 22 of the rod 20 to maintain the helix angle of the insert 11 for a smooth transition of the insert into the tapped hole 15. If the sleeve member 18 fits too loosely around the insert or is omitted, then the helix of the insert will flatten out and the insert will not properly engage the first threads of the parent material.
Further, as illustrated in FIGS. 1 and 2, an adjusting means 16 serves as a jamb nut with the end portion 13 of movable tubular body member 12, thereby adjusting the distance that the lead end 22 of the rod 20 may project out of the tubular body member 12, thus defining the proper depth to which the insert 11 may be installed in a tapped hole.
The bearing member 50, generally made of nylon and fitting around the ring 48 on the front portion of the tubular body member 12, bears against the parent material 17 when the insert 11 is installed to the predetermined depth, and increases the friction on the tool wherein the driving torque is automatically reversed and the mandrel is screwed out of the tapped hole.
In FIGS. 1 and 2 the pivotable catch or pawl 30 of the invention is illustrated within a longitudinal cutout 32 of mandrel assembly 14. The cutout 32 generally does not extend through the front end 21 of the rod 20, but is generally equal in length to the pawl 30. The pawl 30 is biased within the cutout 32 so that a hook portion 34 protrudes through aperture 33 and engages the recess 52 of the tangless wire coil insert 11. The pawl is generally biased about pivot point 36 by springs 38 to locate the hook portion 34 into the recess 52 of the insert when the insert is screwed onto the lead end 22 of the mandrel assembly 14.
The pivotal pawl 30 further includes lead ramps 40, shown in FIG. 3. The ramp 40 in combination with the truncated end portion 46 of the insert provides a camming means for pivoting the pawl 30 inwardly. Accordingly, the important feature of the pivotable pawl 30 is that it has the ability to locate the hook portion 34, which generally extends between two peaks of the threaded portion of the lead end 22 of the rod, only in the recess of the insert 11 to threadably drive the insert 11 into a tapped hole. Further, counter rotation of the cylindrical rod 20, when the insert has reached its predetermined depth, allows the pivotal pawl 30 to automatically disengage from the recess of the insert to permit extraction of the tool. The ramp 40 provided adjacent but on the opposite side of the centerline of the pivotal pawl 30 permits the recess 52 of the insert 11 to automatically push the pawl 30 downward upon counter clockwise rotation of the cylindrical rod 20, and thus providing an automatic extraction of the tool 10.
The pivotable pawl 30 also has a notch 60 rearwardly adjacent the hook portion 34. This notch 60 captures the inner thread of the next adjacent thread to the lead thread of the insert to prevent the recess 52 of the insert from slipping off the hook portion 34 when rearward axial force is applied to the insert. Thus, this anti-slipback notch 60 assures engagement of hook portion 34 and the insert.
As illustrated in FIG. 4, the hook portion 34 of the pawl 30 engages the recess 52 of the lead end 54 in order that the insert 11 may be screwed by means of the tool 10 into a tapped hole. Since both free ends of the helical coiled insert have recesses 52 cut therein, the insert may be inserted in the tool in either direction, thus eliminating the possibility of the operator inserting insert on the tool in the wrong direction.
In order to use the tool for driving an insert 11 into a tapped hole, the insert 11 is screwed onto the lead end 22 of the mandrel assembly 14 until the hook 34 contacts the recess 52 of the lead coil. Then the insert is driven into the tapped hole until the bearing contacts the surface of the tapped hole, whereupon the tool automatically reverses out of the insert and the tapped hole. If after an insert has been installed and the tool removed, it becomes necessary to adjust the depth of the insert in the tapped hole, the tool of the present invention may be reinstalled. To reinstall the tool, the ramp portion 40 of the pivotal pawl 30 cooperates with a truncated portion 46 of the free end of the insert 11 to push the pawl 30 in a downward direction. During reinsertion of the tool 10 the pivotal pawl 30 moves along the inner surface of the coil past the truncated portion of the coil, past the recess 52 of the trailing portion of the coil axially along the insert until the hook portion 34 of the pawl again engages the recess at the lead end of the coil.

Claims (2)

We claim:
1. A tool for inserting a tangless helically coiled insert in a tapped hole comprising:
a tubular body of substantially circular cross-section;
a mandrel insertable into said tubular body and adapted to receive the tangless insert for installation in the tapped hole, said mandrel including,
a driving means at one end,
a threaded portion at the opposite end for screwing the tangless coil thereupon, and
a pivotable pawl extending longitudinally in a cavity adjacent said threaded portion of said mandrel, adapted to engage a notch in the leading coil of the tangless coil when the tangless coil is threaded onto said mandrel whereby rotation of said driving means causes rotation of said tangless coil into the tapped hole;
a sleeve member reciprocably mounted to said tubular body and concentrically disposed about the lead end of said threaded portion, adapted to maintain the helix angle of the insert while inserting the insert into the tapped hole;
a depth adjusting means threadedly mounted on said threaded portion of said mandrel being positioned for engagement with said tubular body to adjust the axial length of said mandrel within said tubular body; and
a bearing means attached to said tubular body at the end opposite said depth adjusting means to limit the friction between the tool and the material around the tapped hole, whereby the driving torque of the tool is automatically reversed at the limiting friction.
2. An installation tool as claimed in claim 1, in which said bearing means is nylon.
US06/581,840 1984-02-21 1984-02-21 Adapter for power tool installation of tangless helically coiled insert Expired - Lifetime US4528737A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US06/581,840 US4528737A (en) 1984-02-21 1984-02-21 Adapter for power tool installation of tangless helically coiled insert
EP85630009A EP0153266B1 (en) 1984-02-21 1985-02-15 Adapter for power tool installation of tangless helically coiled insert
DE8585630009T DE3575271D1 (en) 1984-02-21 1985-02-15 ADAPTATION DEVICE FOR MOTORALLY SCREWING IN A WIRE WRAP THREADED INSERT.
BR8500728A BR8500728A (en) 1984-02-21 1985-02-15 TOOL FOR INSERTING A HELICALLY WRITTEN INSERT INTO A THREADED HOLE
IL74381A IL74381A (en) 1984-02-21 1985-02-19 Power-driven tool for installation of wire coil inserts
ES1985284752U ES284752Y (en) 1984-02-21 1985-02-20 TOOL
MX204387A MX158441A (en) 1984-02-21 1985-02-20 IMPROVEMENTS IN TOOLS WITH ELECTRIC ADAPTER TO INSTALL A WINDING SPIRAL HELICOLID WIRE INSERT WITHOUT TAIL, IN THREADED HOLES
AU38992/85A AU566296B2 (en) 1984-02-21 1985-02-20 Inserting helically coiled inserts
CA000474840A CA1232714A (en) 1984-02-21 1985-02-21 Adapter for power tool installation of tangless helically coiled insert
JP60031667A JPS60191777A (en) 1984-02-21 1985-02-21 Adapter for power tool inserting tongue-less spiral coil inserting body
KR1019850001057A KR880001935B1 (en) 1984-02-21 1985-02-21 Adapter for power tool installation of tangless helically coiled insert
ZA851321A ZA851321B (en) 1984-02-21 1985-02-21 Adapter for power tool installation of tangless helically coiled insert

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/581,840 US4528737A (en) 1984-02-21 1984-02-21 Adapter for power tool installation of tangless helically coiled insert

Publications (1)

Publication Number Publication Date
US4528737A true US4528737A (en) 1985-07-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
US06/581,840 Expired - Lifetime US4528737A (en) 1984-02-21 1984-02-21 Adapter for power tool installation of tangless helically coiled insert

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Country Link
US (1) US4528737A (en)
EP (1) EP0153266B1 (en)
JP (1) JPS60191777A (en)
KR (1) KR880001935B1 (en)
AU (1) AU566296B2 (en)
BR (1) BR8500728A (en)
CA (1) CA1232714A (en)
DE (1) DE3575271D1 (en)
ES (1) ES284752Y (en)
IL (1) IL74381A (en)
MX (1) MX158441A (en)
ZA (1) ZA851321B (en)

Cited By (19)

* Cited by examiner, † Cited by third party
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EP0228981A1 (en) * 1985-12-30 1987-07-15 Vsi Corporation Tangless helically coiled insert
US4768270A (en) * 1986-12-16 1988-09-06 Rexnord, Inc. Installation tool for helical coil inserts
US5040277A (en) * 1989-12-18 1991-08-20 Deutsch Al Combined installation and swaging tool
EP0615818A1 (en) * 1993-02-16 1994-09-21 Kato Spring Works Co. Ltd. Installation tool for tangless helically coiled insert
US5830221A (en) * 1996-09-20 1998-11-03 United States Surgical Corporation Coil fastener applier
US6000114A (en) * 1997-12-31 1999-12-14 Emhart Inc. Insertion tool
US6470557B2 (en) * 1999-09-15 2002-10-29 Emhart Llc Power installation tool for helical coil inserts
US20030009441A1 (en) * 1996-09-20 2003-01-09 Holsten Henry E. Coil fastener applier and removal method
US20070245533A1 (en) * 2006-04-19 2007-10-25 Jan Szewc Adjustable prewinder assembly for wire insert installation tool
US20080104814A1 (en) * 2006-11-07 2008-05-08 Stanley Buchanan Semiautomatic installation tool
US20090293248A1 (en) * 2008-06-03 2009-12-03 Advanex Inc. Tanged insert insertion tool
US20100325857A1 (en) * 2009-06-25 2010-12-30 Newfrey, Llc Retractable Prewinder Assembly With Infinite Adjustability For Installation Of Helically Coiled Wire Inserts
US20150096160A1 (en) * 2012-05-29 2015-04-09 Nippon Sprew Co., Ltd. Extraction tool for tangless spiral coil insert
CN104723274A (en) * 2013-12-24 2015-06-24 北京机床所精密机电有限公司 Disassembling device for spinning assemblies
US9597787B2 (en) 2014-04-07 2017-03-21 Newfrey Llc Iinsertion tool
US20180238591A1 (en) * 2013-03-15 2018-08-23 Thomas Scott Breidenbach Screw-in geothermal heat exchanger systems and methods
CN110900505A (en) * 2019-10-27 2020-03-24 北京点域科技有限公司 Dismounting device for printing machine
US10626900B2 (en) * 2013-09-20 2020-04-21 Böllhoff Verbindungstechnik GmbH Spring connection element
WO2021155998A1 (en) * 2020-02-07 2021-08-12 Völkel GmbH Tool for installing or removing a tangless helically coiled wire insert

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DE19813705A1 (en) * 1998-03-27 1999-11-25 Boellhoff Gmbh Process to position a helicoil in a work piece and associated tool
DE202005000947U1 (en) * 2005-01-20 2005-04-21 Böllhoff Verbindungstechnik GmbH Pivot wire threaded insert mounting/dismounting tool, has driving blade tiltably mounted using knife edge bearings in longitudinal slot of spindle body that is axially held within stop sleeve, which is placed in slot relative to body
TWI542452B (en) * 2010-07-30 2016-07-21 日本史普魯股份有限公司 Insertion tool for tangless spiral coil insert
DE102011051846B4 (en) 2011-07-14 2013-01-24 Böllhoff Verbindungstechnik GmbH Tool for installing or removing a tangless wire thread insert, method of manufacture therefor and method of manually changing a picking blade of this tool
JP5873525B2 (en) * 2013-09-02 2016-03-01 株式会社アドバネクス Tool for tongueless coil thread
DE102016114824A1 (en) 2016-08-10 2018-02-15 Böllhoff Verbindungstechnik GmbH Tool for installing or removing a wire thread insert and manufacturing method therefor
US10807576B2 (en) 2016-11-09 2020-10-20 Allison Transmission, Inc. Brake actuator-based prognostic system and method thereof
DE102016125481A1 (en) 2016-12-22 2018-06-28 Böllhoff Verbindungstechnik GmbH Installation tool for a wire thread insert
CN115351750B (en) * 2022-10-19 2023-03-14 江苏拓米洛环境试验设备有限公司 Hole sleeve mounting device and mounting method

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US2586805A (en) * 1949-03-02 1952-02-26 Heli Coil Corp Inserting tool for tangless coils
US2584118A (en) * 1950-05-27 1952-02-05 Heli Coil Corp Tool for inserting screw thread linings
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US1676755A (en) * 1925-09-18 1928-07-10 Walton Alfred Leonard Game apparatus
US2390524A (en) * 1944-05-30 1945-12-11 Aircraft Screw Prod Co Insert assembling tool
US2392843A (en) * 1944-10-25 1946-01-15 Aircraft Screw Prod Co Insert securing tool
US2832129A (en) * 1954-01-11 1958-04-29 Heli Coil Corp Tool for inserting wire coil screw threads

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0228981A1 (en) * 1985-12-30 1987-07-15 Vsi Corporation Tangless helically coiled insert
US4768270A (en) * 1986-12-16 1988-09-06 Rexnord, Inc. Installation tool for helical coil inserts
US5040277A (en) * 1989-12-18 1991-08-20 Deutsch Al Combined installation and swaging tool
EP0615818A1 (en) * 1993-02-16 1994-09-21 Kato Spring Works Co. Ltd. Installation tool for tangless helically coiled insert
AU671507B2 (en) * 1993-02-16 1996-08-29 Kato Spring Works Company, Ltd. Improved installation tool for tangless helically coiled insert
US5830221A (en) * 1996-09-20 1998-11-03 United States Surgical Corporation Coil fastener applier
US20030009441A1 (en) * 1996-09-20 2003-01-09 Holsten Henry E. Coil fastener applier and removal method
US6000114A (en) * 1997-12-31 1999-12-14 Emhart Inc. Insertion tool
US6470557B2 (en) * 1999-09-15 2002-10-29 Emhart Llc Power installation tool for helical coil inserts
US20070245533A1 (en) * 2006-04-19 2007-10-25 Jan Szewc Adjustable prewinder assembly for wire insert installation tool
US7634844B2 (en) 2006-04-19 2009-12-22 Newfrey Llc Adjustable prewinder assembly for wire insert installation tool
US20080104814A1 (en) * 2006-11-07 2008-05-08 Stanley Buchanan Semiautomatic installation tool
EP2130650A1 (en) * 2008-06-03 2009-12-09 Advanex Inc. Tanged insert insertion tool
US20090293248A1 (en) * 2008-06-03 2009-12-03 Advanex Inc. Tanged insert insertion tool
US20100325857A1 (en) * 2009-06-25 2010-12-30 Newfrey, Llc Retractable Prewinder Assembly With Infinite Adjustability For Installation Of Helically Coiled Wire Inserts
US8495807B2 (en) 2009-06-25 2013-07-30 Newfrey Llc Retractable prewinder assembly with infinite adjustability for installation of helically coiled wire inserts
US20150096160A1 (en) * 2012-05-29 2015-04-09 Nippon Sprew Co., Ltd. Extraction tool for tangless spiral coil insert
US9421676B2 (en) * 2012-05-29 2016-08-23 Nippon Sprew Co., Ltd. Extraction tool for tangless spiral coil insert
US20180238591A1 (en) * 2013-03-15 2018-08-23 Thomas Scott Breidenbach Screw-in geothermal heat exchanger systems and methods
US11892201B2 (en) * 2013-03-15 2024-02-06 Thomas Scott Breidenbach Installation apparatus/tool for tubular geothermal heat exchanger systems and methods
US10626900B2 (en) * 2013-09-20 2020-04-21 Böllhoff Verbindungstechnik GmbH Spring connection element
CN104723274B (en) * 2013-12-24 2017-03-08 北京机床所精密机电有限公司 A kind of filament spinning component attaching/detaching apparatus
CN104723274A (en) * 2013-12-24 2015-06-24 北京机床所精密机电有限公司 Disassembling device for spinning assemblies
US9597787B2 (en) 2014-04-07 2017-03-21 Newfrey Llc Iinsertion tool
CN110900505A (en) * 2019-10-27 2020-03-24 北京点域科技有限公司 Dismounting device for printing machine
WO2021155998A1 (en) * 2020-02-07 2021-08-12 Völkel GmbH Tool for installing or removing a tangless helically coiled wire insert

Also Published As

Publication number Publication date
MX158441A (en) 1989-01-31
ES284752U (en) 1985-09-01
DE3575271D1 (en) 1990-02-15
IL74381A (en) 1987-03-31
KR880001935B1 (en) 1988-10-04
JPH0438543B2 (en) 1992-06-24
AU3899285A (en) 1985-09-05
BR8500728A (en) 1985-10-08
EP0153266A2 (en) 1985-08-28
CA1232714A (en) 1988-02-16
EP0153266A3 (en) 1987-07-15
EP0153266B1 (en) 1990-01-10
ES284752Y (en) 1987-01-16
ZA851321B (en) 1986-10-29
KR850007034A (en) 1985-10-30
AU566296B2 (en) 1987-10-15
JPS60191777A (en) 1985-09-30
IL74381A0 (en) 1985-05-31

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